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Grease

PhotonFanatic

Flashlight Enthusiast
Joined
Dec 17, 2003
Messages
2,337
Location
western Massachusetts
You can use just about anything you like--the O-rings are Buna-N, which is impervious to just about anything, other than acid. :)

I use Teflon-impregnated oil for most of my lights.
 
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